CN108255034A - Delevoping cartridge - Google Patents

Abstract

The present invention provides a developing cartridge including: a casing configured to accommodate toner therein; a developing roller rotatable about a first axis extending in an axial direction; a cam electrically connected to the developing roller capable of Rotating from a first position to a second position in a rotational direction with respect to a second axis extending in the axial direction, with the cam located in the first position, the cam is located in the axial direction a third position at a first distance from the housing, and when the cam is at the second position, the cam is at a fourth position at a second distance from the housing in the direction of the axis position, the second distance is greater than the first distance; and a gear, rotatable about the second axis, cooperates with the cam when the cam is in the first position, in When the cam is in the second position, the gear is disengaged from the cam.

Description

Developing cartridge

technical field

The present invention relates to a developing cartridge having a developing roller.

Background technique

Conventionally, a developing cartridge having a developing roller is known. The developing cartridge is attachable to and detachable from the image forming apparatus.

The prior art discloses a developing cartridge having a developing roller and electrodes connected to the developing roller. The electrode includes a shaft capable of contacting a power supply portion of the image forming apparatus. The developing cartridge also includes a gear rotatable about the shaft and a protrusion located on the gear. The protrusion can move circularly together with the rotation of the gear, and is in contact with the actuator of the image forming apparatus. The actuator moves due to the contact protrusion. The image forming apparatus detects the movement of the actuator, thereby judging the specification of the developing cartridge.

There is a need for a single member capable of performing the functions of the electrodes and protrusions described above.

Contents of the invention

In view of this, an object of the present invention is to provide a developing cartridge capable of detecting the specification of the developing cartridge by using a member electrically connected to the developing roller.

In order to achieve the above and other objects, the present invention provides a developing cartridge comprising: a housing configured to accommodate toner therein; a developing roller rotatable about a first axis extending in an axial direction; a cam electrically connected to the developing roller rotatable in a rotational direction about a second axis extending in the axial direction from a first position to a second position, with the cam in the first position, the cam is located at a third position at a first distance from the housing in the axial direction, and when the cam is located in the second position, the cam is located at a distance from the housing in the axial direction a fourth position from a second distance, the second distance being greater than the first distance; and a gear rotatable about the second axis, with the cam in the first position, the gear Cooperate with the cam, and when the cam is in the second position, the gear is disengaged from the cam.

Description of drawings

The features, advantages and other objects of the present invention will become clear through the following description in conjunction with the accompanying drawings, wherein:

Fig. 1 is a perspective view of a developer cartridge according to one embodiment viewed from one side in the axial direction of the developer cartridge;

2 is a perspective view of the developer cartridge according to the embodiment viewed from the other side in the direction of the axis of the developer cartridge;

Fig. 3 is an exploded perspective view of the developing cartridge according to the embodiment, specifically showing parts of the other end of the developing cartridge;

4 is a perspective view of a developing cartridge according to an embodiment, specifically showing bearings, idlers, etc. assembled to a housing of the developing cartridge;

5 is a perspective view of a cam and a gear cover in the developing cartridge according to the embodiment;

6A is a perspective view for explaining the relationship between the protrusion of the gear cover and the respective contact surfaces of the cam in the developing cartridge according to the embodiment, specifically showing the initial state of the cam;

6B is a cross-sectional view showing a fitting state between a protrusion of an idler wheel and a fitting groove of a cam in the developing cartridge according to the embodiment and in the state of FIG. 6A;

7 is a perspective view illustrating a state where a cam is slightly rotated after an initial state in the developing cartridge according to the embodiment;

FIG. 8A is a perspective view showing a state where a cam moves from a third position to a fourth position;

8B is a cross-sectional view showing a fitting state between a protrusion of an idler wheel and a fitting groove of a cam in the developing cartridge according to the embodiment and in the state of FIG. 8A;

Fig. 9A is a perspective view of a cam and a gear cover in a developing cartridge according to a modified example;

9B is a cross-sectional view showing the relationship between the protrusion and the first contact surface in the developing cartridge according to the modified example; and

9C is a cross-sectional view illustrating a relationship between a protrusion and a first contact surface in a developing cartridge according to a modified example and in a state subsequent to the state of FIG. 9B .

Detailed ways

A developing cartridge 1 according to an embodiment will be described below with reference to FIGS. 1 to 8B . The developing cartridge 1 includes a housing 11 , a developing roller 12 rotatable about a first axis X1 , a supply roller (not shown), an agitator (not shown), and a coupling 13 . The casing 11 accommodates toner therein. In the following description, the extending directions of the first axis X1 and the second axis X2 (to be described later) are also referred to as "axis directions".

The developing roller 12 is configured to supply toner to an electrostatic latent image formed on a photoreceptor (not shown). The developing roller 12 includes a shaft 12A extending in the axial direction and made of metal.

The supply roller is configured to supply toner to the developing roller 12 . The agitator is configured to agitate the toner contained in the housing 11 .

The coupling 13 is configured to receive a driving force from the outside. Specifically, the image forming apparatus (not shown) includes a casing (not shown) and an input member (not shown). The input member is movable in an advancing direction or a retracting direction. The input member moving in the advancing direction cooperates with the coupler 13 in the rotational direction of the coupler 13 so that the driving force is transmitted from the input member to the coupler 13 . The driving force is then transmitted to the developing roller 12, the supply roller and the agitator through a gear mechanism (not shown).

The coupling 13 is located on one side of the housing 11 in the axial direction. As shown in FIG. 2 , the cam 20 is located on the other side of the housing 11 in the axial direction. In other words, the coupling 13 is located on the opposite side to the cam 20 with respect to the housing 11 . That is to say, the coupler 13 is located on one side wall of the housing 11 , and the cam 20 is located on the other side wall 11A of the housing 11 opposite to the one side wall.

The cam 20 is configured to move the actuator AC of the cabinet. The actuator AC is rotatably supported by the casing and is made of a conductive material. The cabinet includes a power supply for supplying power to the actuator AC and an optical sensor for detecting rotation of the actuator AC.

The cam 20 is rotatable about the second axis X2 from the first position to the second position by the driving force received by the coupling 13 and transmitted by the gear mechanism and the agitator. That is, the driving force received by the coupling 13 is transmitted from one side of the housing 11 in the axial direction to the other side through the shaft of the agitator. The second axis X2 is parallel to the first axis X1.

As shown in FIG. 3 , in addition to the cam 20 , an agitator gear 31 , an idler gear 32 as an example of a gear, a bearing 40 , a compression coil spring SP as an example of a spring, and a gear cover 50 are also located on the housing 11 . on the other side of the axis. The case 11, the agitator gear 31, the idler gear 32 and the gear cover 50 are made of non-conductive resin.

The cam 20, the bearing 40 and the compression coil spring SP are made of conductive material. Specifically, the cam 20 and the bearing 40 are made of conductive resin such as polyacetal containing carbon powder. The compression coil spring SP is made of metal.

The stirrer gear 31 is fixed on the other end of the stirrer shaft. The agitator gear 31 is rotatable together with the agitator shaft.

The boss 11B extends away from the side wall 11A in the axial direction from the side wall 11A of the housing 11 , and the idler 32 is rotatably supported to the boss 11B (see FIG. 4 ). The idler 32 is rotatable about the second axis X2. The idler gear 32 is located between the agitator gear 31 and the developing roller 12 . The diameter of the idler gear 32 is larger than that of the agitator gear 31 . The idler gear 32 includes a gear wheel portion 32A, a rotation shaft 32B, and gear teeth 32C. The gear wheel portion 32A is in the shape of a disc concentric with the second axis X2. The gear teeth 32C are located on the entire peripheral surface of the gear wheel portion 32A. The rotation shaft 32B extends away from the side wall 11A in the axial direction from the gear wheel portion 32A. The rotating shaft 32B has a hollow cylindrical shape.

As shown in FIG. 4 , gear teeth 32C of the idler gear 32 mesh with the agitator gear 31 . Therefore, the idler pulley 32 can rotate together with the developing roller 12 by the driving force received by the coupling 13 . The rotary shaft 32B has a distal end opposite to the gear wheel portion 32A in the axial direction, and has two protrusions 32D protruding from the distal end. The two protrusions 32D are located on diametrically opposite sides with respect to the second axis X2. The cam 20 has a fitting groove 22D (see FIG. 5 ). In a fitted state where each protrusion 32D is located in each fitting groove 22D, each protrusion 32D is capable of contacting each fitting groove 22D in the rotation direction of the idler gear 32 .

As shown in FIG. 3 , the bearing 40 is configured to rotatably support the shaft 12A of the developing roller 12 , and is electrically connected to the shaft 12A of the developing roller 12 . The bearing 40 includes a base portion 41 , a bearing portion 42 , and a support portion 43 .

The base 41 is a plate-like member extending in a direction perpendicular to the axial direction. Specifically, the base portion 41 extends in a length straddling the shaft 12A of the developing roller 12 and the boss 11B. The base 41 has a through hole 41A through which the boss 11B extends. The base 41 is located between the side wall 11A of the housing 11 and the idler 32 in the axial direction.

The bearing portion 42 has a hollow cylindrical shape and rotatably supports the shaft 12A of the developing roller 12 . The bearing portion 42 protrudes away from the side wall 11A in the axial direction from the base portion 41 . The base portion 41 has a hole corresponding to the inner peripheral surface of the bearing portion 42 . The hole of the base portion 41 is configured to rotatably support the shaft 12A of the developing roller 12 together with the bearing portion 42 .

The support portion 43 is configured to support an arm SP2 (described later) of the compression coil spring SP. The support portion 43 is located at the base portion 41 . The support portion 43 protrudes away from the side wall 11A in the axial direction from the base portion 41 . The support portion 43 is located between the bearing portion 42 and the through hole 41A. The support portion 43 has a distal end surface opposite to the base portion 41 (casing 11 ) in the axial direction. In addition, the idler 32 includes a surface A1 facing the bearing 40 and an opposite surface A2 opposite to the surface A1. Here, the distal end surface of the support portion 43 is farther from the base portion 41 than the opposite surface A2 (see FIG. 4 ). The distal end face of the support portion 43 includes a groove 43A. An arm SP2 (described later) of the compression coil spring SP is located at the groove 42A.

The compression coil spring SP is located between the cam 20 and the gear wheel portion 32A of the idler gear 32 in the axial direction. The compression coil spring SP is configured to urge the cam 20 in the direction away from the side wall 11A in the axial direction. That is, the compression coil spring SP is configured to urge the cam 20 in a direction away from the idler gear 32 .

The compression coil spring SP includes a coil portion SP1 and an arm SP2 extending from the coil portion SP1 in a direction crossing the axis direction. The spiral portion SP1 is attached to the rotation shaft 32B of the idler 32 so as to surround the outer peripheral surface of the rotation shaft 32B of the idler gear 32 . That is, the rotation shaft 32B is located in the inner space of the spiral portion SP1. One end of the spiral portion SP1 in the axial direction is located on the cam 20 .

The arm SP2 extends radially outward from the other end of the spiral portion SP1. The arm SP2 has a head end portion (the other end portion of the compression coil spring SP) in contact with the support portion 43 of the bearing 40 . Therefore, the cam 20 is in electrical contact with the developing roller 12 through the compression coil spring SP and the bearing 40 .

The gear cover 50 is configured to cover part of the idler gear 32 and the agitator gear 31 . The gear cover 50 is fixed to the case 11 by screws SC. The gear cover 50 includes a small-diameter portion 51 , a large-diameter portion 52 and a protruding portion 53 . The small-diameter portion 51 covers the agitator gear 31 , and the large-diameter portion 52 covers the idler gear 32 . The protrusion 53 accommodates a part of the cam 20 . The protruding portion 53 protrudes away from the side wall 11A in the axial direction from the large diameter portion 52 . The protruding portion 53 has a hollow cylindrical shape. The cam 20 has an end surface opposite to the gear wheel portion 32A in the axial direction, and the end surface of the cam 20 is further away from the gear wheel portion 32A than the protruding portion 53 . As shown in FIG. 5 , the protrusion 53 has an inner peripheral surface 53A facing the cam 20 and a protrusion 54 protruding from the inner peripheral surface 53A toward the cam 20 .

Returning to FIG. 3 , the cam 20 is rotatably attached to the boss 11B of the casing 11 . Specifically, the cam 20 has a through hole 20A extending in the axial direction. The inner peripheral surface of the through hole 20A is rotatably supported by the boss 11B. Thus, the cam 20 is rotatable about the second axis X2. The cam 20 includes a first portion 21 having a substantially sector shape and a second portion 22 having a substantially cylindrical shape. A part of the first portion 21 is located outside the gear cover 50 in the axial direction. The second part 22 is located in the inner space of the protruding part 53 . The compression coil spring SP is in contact with a first end surface of the second portion 22 in the axial direction, the first end surface being the side facing the case 11 .

The first portion 21 protrudes from a second end surface of the second portion 22 in the axial direction, which is opposite to the first end surface. The first portion 21 has a first arcuate surface 21A and a second arcuate surface 21B extending in the rotation direction of the cam 20 . A first length is defined between the first arcuate surface 21A and the second axis X2. A second length is defined between the second arcuate surface 21B and the second axis X2. The second length is greater than the first length. The first portion 21 also has two flat surfaces 21C extending between each end of the first arcuate surface 21A and each end of the second arcuate surface 21B. Of the planes 21C, the plane located upstream of the first arcuate surface 21A and downstream of the second arcuate surface 21B in the rotation direction of the cam 20 serves as a cam surface that urges the actuator AC.

The diameter of the second portion 22 is smaller than the diameter of the idler 32 . The radius of the second portion 22 is approximately equal to the second length. The second portion 22 has an outer peripheral surface. The outer peripheral surface has a C-shaped guide groove 22A extending in the rotation direction of the cam 20 . The guide groove 22A opens at a radially outer end. The second part 22 also has two fitting grooves 22D.

As shown in FIG. 5 , the guide groove 22A has one end portion and the other end portion located at the same position in the axial direction. The first groove 22B is connected to one end portion of the guide groove 22A, and the second groove 22C is connected to the other end portion of the guide groove 22A. One side surface F1 of the guide groove 22A in the axial direction is closer to the housing 11 than the other side surface. One side surface F1 serves as a first contact surface F1 that contacts the protrusion 54 of the gear cover 50 in the axial direction.

The first groove 22B extends away from the side wall 11A from one end portion of the guide groove 22A in the axial direction. The first groove 22B opens radially outward, and opens toward the side opposite to the housing 11 in the axial direction. The first groove 22B serves as an insertion opening, allowing the protrusion 54 of the gear cover 50 to be guided into the guide groove 22A during assembly.

The second groove 22C extends from the other end portion of the guide groove 22A in the axial direction toward the housing 11 . The second groove 22C opens radially outward, but does not open toward the housing 11 in the axial direction. The end face F2 of the second groove 22C is closer to the housing 11 in the axial direction than the other end face connected to the guide groove 22A. The end face F2 serves as a second contact face F2 capable of contacting the protrusion 54 of the gear cover 50 in the axial direction. The position of the second contact surface F2 is different from the position of the first contact surface F1 in the axial direction and the rotation direction of the cam 20 . Specifically, the second contact surface F2 is closer to the housing 11 in the axial direction than the first contact surface F1.

Each fitting groove 22D extends from the end surface of the second part 22 toward the first part 21 in the axial direction. Each fitting groove 22D is capable of fitting with each of two protrusions 32D ( FIG. 3 ) of the idler 32 . Each matching groove 22D is located on the radially outer side of the through hole 20A, and is connected with the through hole 20A. Each fitting groove 22D is located at a position corresponding to the position of each protrusion 32D of the idler 32 .

With the cam 20 structured as described above, the cam 20 can be rotated in the rotational direction from the first position shown in FIG. 6A to the second position shown in FIG. 8A . When the cam 20 is at the first rotation position, the cam 20 is at the third position, and the distance from the housing 11 to the cam 20 in the axial direction is the first distance. When the cam 20 is at the second rotational position, the cam 20 is at the fourth position, and the distance from the housing 11 to the cam 20 in the axial direction is the second distance. The second distance is greater than the first distance. That is, the cam 20 moves from the third position to the fourth position in the axial direction according to the rotation of the cam 20 from the first position to the second position.

Specifically, as shown in FIG. 6A , when the cam 20 is located at the third position (first rotational position), the protrusion 54 of the gear cover 50 contacts the first contact surface F1 in the axial direction. In addition, when the cam 20 is at the third position (the first rotation position), the idler 32 is in a mating state where the protrusion 32D of the idler 32 is mated with the fitting groove 22D of the cam 20 , as shown in FIG. 6B . Therefore, in the third position of the cam 20 , driving force can be transmitted from the idler gear 32 to the cam 20 .

As shown in FIG. 8A , with the cam 20 at the fourth position (second rotational position), the protrusion 54 of the gear cover 50 is in contact with the second contact surface F2 in the axial direction. Further, in the state where the cam 20 is at the fourth position (second rotational position), since the engaging groove 22D moves in a direction away from the side wall 11A, the engaging groove 22D is disengaged from the protrusion 32D of the idler wheel 32 . Therefore, the idler gear 32 becomes a disengaged state in which the idler gear 32 is disengaged from the cam 20 . Therefore, at the fourth position of the cam 20, the transmission of the driving force from the idler gear 32 to the cam 20 is cut off.

Further, at the third position of the cam 20 (the first rotational position of the cam 20 ), the compression coil spring SP is in the first state in which the compression coil spring SP has the first spring length in the axial direction. At the fourth position of the cam 20 (the second rotational position of the cam 20 ), the compression coil spring SP is in a second state in which the compression coil spring SP has a second spring length in the axial direction that is larger than the first spring length. In the fourth position of the cam 20 (the second rotational position of the cam 20), the second spring length is smaller than the natural length of the compression coil spring SP in the axial direction.

Next, the operation of each member constituting the developing cartridge 1 will be described.

As shown in FIG. 2, in a state where a new developing cartridge 1 is installed in the cabinet of the image forming apparatus, the first arcuate surface 21A of the cam 20 is in contact with the electrodes of the actuator AC. In addition, the first arcuate surface 21A pushes the actuator AC so that the actuator AC rotates from the first rotational position to the second rotational position.

The optical sensor detects the displacement of the actuator AC from the first rotational position to the second rotational position. Therefore, the controller of the cabinet of the image forming apparatus determines that the developing cartridge 1 is mounted in the cabinet.

Thereafter, when the driving force from the driving source of the cabinet is input to the coupling 13 of the developing cartridge 1, the driving force is transmitted from the coupling 13 to the shaft of the agitator through the gear mechanism. As shown in FIG. 6A , the driving force transmitted to the shaft of the agitator is then transmitted to the idler gear 32 through the agitator gear 31 .

As shown in FIG. 6B , by the rotation of the idler gear 32 , the driving force is transmitted from the protrusion 32D to the fitting groove 22D. Therefore, as shown in FIG. 7 , the cam 20 rotates together with the idler gear 32 .

By the rotation of the cam 20, the actuator AC is pressed by the flat surface 21C of the cam 20, so that the actuator AC rotates from the second rotational position toward the third rotational position. When the second arcuate surface 21B of the cam 20 is in contact with the actuator AC, the actuator AC is in the third rotational position. The optical sensor detects the displacement of the actuator AC from the second rotational position to the third rotational position. Therefore, the controller judges that the developing cartridge 1 is a new cartridge.

During the rotation of the cam 20, the protrusion 54 moves relative to the cam 20 while sliding on the first contact surface F1, gradually approaching the second contact surface F2. Then, as shown in FIG. 8A , when the protrusion 54 moves away from the first contact surface F1 , the cam 20 moves in the axial direction from the third position to the fourth position in a direction away from the idler 32 . Specifically, when the protrusion 54 is disengaged from the first contact surface F1, the cam 20 is moved in the axial direction in a direction away from the side wall 11A by the force of the compression coil spring SP. Then, when the protrusion 54 comes into contact with the second contact surface F2, the movement of the cam 20 stops at the fourth position. The protrusion 32D is disengaged from the fitting groove 22D by the movement of the cam 20 in the axial direction.

In this case, the cam 20 is rotated approximately 360 degrees from the initial state, so that the first arcuate surface 21A supports the actuator AC again. That is, the actuator AC is located at the second rotational position after the power transmission to the cam 20 is cut off. Therefore, the actuator AC can be displaced from the first rotational position to the second rotational position in the case where the used developing cartridge 1 is mounted again in the cabinet. Therefore, the controller can determine whether or not the developer cartridge 1 is attached to the cabinet.

The developing cartridge 1 according to the above-described embodiment has the effect that the actuator AC can be operated by the cam 20 that rotates from the first rotational position to the second rotational position due to power transmission from the idler gear 32 . Therefore, it is possible to detect the specifications of the developing cartridge 1, for example, whether the developing cartridge 1 is a new cartridge. Furthermore, since the drive force transmission to the cam 20 is cut off by the movement of the cam from the third position to the fourth position, the actuator AC can be operated as desired. In addition, since the cam 20 is made of a conductive material and is electrically connected to the developing roller 12 , electric power supplied to electrodes provided on the actuator AC can be supplied to the developing roller 12 through the cam 20 .

Furthermore, since the compression coil spring SP is provided for urging the cam 20 in a direction away from the idler gear 32, the cam 20 can move from the third position to the fourth position as desired.

Further, since the compression coil spring SP is in contact with the cam 20 and the bearing 40 , electric power can be supplied to the developing roller 12 through the cam 20 , the compression coil spring SP and the bearing 40 .

Furthermore, since the compression coil spring SP is located between the cam 20 and the idler gear 32 in the axial direction, it is possible to efficiently utilize the space between the cam 20 and the idler gear 32 to arrange the compression coil spring SP.

In addition, since the cam 20 is made of conductive resin, the cam 20 can be easily manufactured.

The present invention has various modifications. In the following description, the same components are denoted by the same reference numerals as in the above-mentioned embodiment, and detailed description thereof will be omitted.

According to the above embodiment, the protrusion 54 is located at the gear cover 50 , and the first contact surface F1 is located at the cam 20 . However, as shown in FIG. 9A , according to a modified example, the protrusion 24 may be located at the cam 20A, and the first contact surface F11 may be located at the gear cover 50A.

More specifically, according to the present modification, the cam 20A includes a first portion 21 similar to the first portion 21 of the above-described embodiment and a second portion 23 different from the second portion 22 of the above-described embodiment. The second portion 23 includes a protrusion 24 and a flange 25 instead of forming the above-mentioned grooves 22A, 22B, and 22C.

The flange 25 protrudes radially outward from an end portion of the second portion 23 in the axial direction, which end portion faces the housing 11 . The protrusion 24 protrudes away from the side wall 11A in the axial direction from the flange 25 , and protrudes radially outward from the outer peripheral surface of the second portion 23 .

The gear cover 50A includes a first contact surface F11 and a concave portion 55 . The first contact surface F11 contacts the protrusion 24 at the third position of the cam 20 . The recess 55 is recessed away from the side wall 11A in the axial direction from the first contact surface F11 . The recess 55 opens toward the housing 11 in the axial direction, and also opens radially inward. The depth of the recess 55 in the axial direction is greater than the length of the projection 24 protruding from the flange 25 .

According to this modification, as shown in FIG. 9B , by rotation of the cam 20 at the third position, the protrusion 24 of the cam 20 moves while sliding on the first contact surface F11 of the gear cover 50A. As shown in FIG. 9C , after the protrusion 24 moves past the first contact surface F11 , the cam 20 moves away from the side wall 11A in the axial direction due to the force applied by the compression coil spring SP. Therefore, the flange 25 is in contact with the first contact surface F11. Therefore, the cam 20 is in the fourth position.

Furthermore, according to the above-described embodiment, the compression coil spring SP is entirely located between the cam 20 and the idler gear 32 in the axial direction. However, it may be that a part of the spring is located between the cam 20 and the idler 32 in the axial direction. In addition, leaf springs and torsion springs may be used instead of compression coil springs.

In addition, according to the above-mentioned embodiment, the idler gear 32 which meshes with the agitator gear 31 is used as an example of a gear. However, any type of gear can be used. In addition, toothless friction wheels that transmit power to adjacent members by friction can also be used.

Furthermore, according to the above-described embodiment, the protrusion 32D is located at the idler 32 and the fitting groove 22D is located at the cam 20 . However, the protrusion may be located at the cam, and the engaging groove capable of engaging with the protrusion in the rotation direction may be located at the gear.

Furthermore, according to the above-described embodiment, a part of the idler gear 32 is covered by the gear cover 50 . However, the idler gear can be fully covered by the gear cover.

In addition, the components appearing in the above-described embodiments and modifications may be combined as appropriate.

Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes and modifications can be made without departing from the spirit of the present invention.

Claims (20)

1. a kind of Delevoping cartridge, including：

Housing is configured to accommodate toner wherein；

Developer roll, can be about the first axle rotation extended in the axial direction；

Cam is electrically connected to the developer roll, can be about the second axis extended on the axis direction in direction of rotation On from first position rotate to the second position, in the case where the cam is located at the first position, the cam is located at With the third place of first distance of housing distance on the axis direction, it is located at the feelings of the second position in the cam Under condition, the cam is located on the axis direction with the housing apart from the 4th position of second distance, described second away from With a distance from more than described first；And

Gear can be rotated about the second axis, in the case where the cam is located at the first position, the gear With the cam engagement, in the case where the cam is located at the second position, the gear is released with the cam to be coordinated.

2. Delevoping cartridge according to claim 1, which is characterized in that further include between the cam and the gear Spring.

3. Delevoping cartridge according to claim 2, which is characterized in that the spring has first state and the second state,

The first state is in a state that the cam is located at the first position, and the spring is on the axis direction Length be the first length state,

Second state is in a state that the cam is located at the second position, and the spring is on the axis direction Length be the second spring length bigger than first length state.

4. Delevoping cartridge according to claim 3, which is characterized in that the spring on the axis direction have with it is described One end of cam contact.

5. Delevoping cartridge according to claim 4, which is characterized in that the developer roll includes axis,

The Delevoping cartridge further includes the bearing for supporting the axis and being electrically connected to the axis,

The spring has the other end opposite with described one end on the axis direction, and the other end connects with the bearing It touches.

6. Delevoping cartridge according to claim 5, which is characterized in that the spring is helical spring.

7. Delevoping cartridge according to claim 6, which is characterized in that the helical spring includes spire and from the spiral The arm that portion is upwardly extended in the side intersected with the axis direction,

The bearing includes the support portion for supporting the arm, and the support portion is prominent on the axis direction.

8. Delevoping cartridge according to claim 7, which is characterized in that the support portion has the head end opposite with the housing Portion, the cephalic par have slot, and the arm is located in the slot.

9. Delevoping cartridge according to claim 7 or 8, which is characterized in that the bearing further includes plate-like base portion, described Base portion have be used to support the developer roll the axis hole, the support zone at the base portion,

The support portion has end surface on the axis direction,

The gear has the first end face and the second end face opposite with the first end face in face of the bearing,

The end surface of the support portion is more farther apart from the base portion than the second end face.

10. Delevoping cartridge according to claim 7 or 8, which is characterized in that the spire is located at described the when the cam There is length on the axis direction, the length is less than the natural length of the spire during two positions.

11. according to Delevoping cartridge according to any one of claims 1 to 8, which is characterized in that the gear includes：

Gear wheel portion, has circumference, and the circumference has gear teeth；

Rotary shaft extends on the axis direction from the gear wheel portion, and the rotary shaft has on the axis direction Head end；And

Protrusion is protruded from the head end of the rotary shaft, in the state of the gear and the cam engagement, the protrusion On the direction of rotation of the gear with the cam contact.

12. Delevoping cartridge according to claim 2, which is characterized in that the spring is helical spring.

13. Delevoping cartridge according to claim 12, which is characterized in that it is characterized in that, the gear includes：

Gear wheel portion, has circumference, and the circumference has gear teeth；

Rotary shaft, extends on the axis direction from the gear wheel portion, and the rotary shaft is located at the interior of the helical spring In portion space.

14. Delevoping cartridge according to claim 13, which is characterized in that the rotary shaft includes protrusion, and the protrusion is from institute The head end for stating rotary shaft protrudes, and in the state of the cam and gear cooperation, the protrusion is in the rotation of the gear On direction with the cam contact.

15. according to the Delevoping cartridge described in claim 1~8 and any one of 12~14, which is characterized in that the Delevoping cartridge also wraps Include the bearing for the axis for supporting the developer roll, one end on the axis direction of the spring and the cam contact, institute State the other end opposite with described one end on the axis direction of spring and the bearing touch.

16. according to the Delevoping cartridge described in claim 1~8 and any one of 12~14, which is characterized in that the Delevoping cartridge also wraps At least part of gear cap for covering the gear is included, the gear cap includes the protrusion protruded towards the cam,

The cam has the first contact surface and the second contact surface, and first contact surface is configured on the axis direction Contacted with the protrusion, second contact surface on the axis direction and on the direction of rotation of the cam be located at The different position in the position of first contact surface,

In a state that the cam is located at the first position, first contact surface is contacted with the protrusion,

In a state that the cam is located at the second position, second contact surface is contacted with the protrusion.

17. according to the Delevoping cartridge described in claim 1~8 and any one of 12~14, which is characterized in that hookup is further included, The hookup is located relative to the housing position opposite with the cam.

18. according to the Delevoping cartridge described in claim 1~8 and any one of 12~14, which is characterized in that the cam has the One arcwall face and the second arcwall face, first arcwall face and second arcwall face are on the direction of rotation of the cam Extension,

The distance between first arcwall face and the second axis are the first length,

The distance between second arcwall face and the second axis are second length bigger than first length.

19. according to the Delevoping cartridge described in claim 1~8 and any one of 12~14, which is characterized in that the gear has position In the gear teeth of entire circumferential surface.

20. according to the Delevoping cartridge described in claim 1~8 and any one of 12~14, which is characterized in that the cam can be It is moved on axis direction along second axis extension.